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  <a name="SAP_HANA_0107"></a><a name="SAP_HANA_0107"></a>
  <h1 class="topictitle1">IO通道数过小导致SAP HANA备份或恢复任务失败</h1>
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    <h4 class="sectiontitle">现象描述</h4>
    <p>通用数据库SAP HANA备份或恢复任务执行失败，原因显示为执行命令异常。</p>
   </div>
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    <h4 class="sectiontitle">可能原因</h4>
    <p>初始设置的IO通道数太小，导致大量SAP HANA备份或恢复任务执行后，通道数耗尽，任务失败。</p>
   </div>
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    <h4 class="sectiontitle">处理步骤</h4>
    <ol>
     <li><span>使用PuTTY，登录执行当前任务的客户端所在主机。</span><p></p><p>客户端所在主机的IP地址为子任务中展示的IP地址（在OceanProtect管理界面的任务界面查看）。</p> <p></p></li>
     <li><span>执行如下命令，打开配置文件。</span><p></p><pre class="screen">vim /etc/sysctl.conf</pre> <p></p></li>
     <li><span>检查fs.aio-max-nr字段的值，当字段值远小于18446744073709551615时，修改字段值为18446744073709551615。</span></li>
     <li><span>修改并保存配置文件后，执行<strong>sysctl -p /ect/sysctl.conf</strong>命令使配置生效。</span></li>
     <li><span>重新发起备份或恢复任务。</span></li>
    </ol>
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     <strong>父主题：</strong> <a href="SAP_HANA_0100.html">常见问题</a>
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